The synthesis of retro-analog of methionine-5-enkephalin was performed. This peptide is an isomer of the natural methionine-5-enkephalin, but differs from it by opposite direction of peptide linkages between the amino acid residues. The influence of retro-analog on prolactin secretion was studied both in vivo and in vitro. The retro-analog was found to stimulate the prolactin secretion more effectively than methionine-5-enkephalin.
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